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Separation of Phthises

Experimental conditions:
Instrument: Trisep-2010 GV CEC system;
Column: 200mm×100μm I.D. capillary packed with 3μm C18;
Mobile phase: water /methanol=40/60 (V/V);
Applied voltage: -5 kV;
Pressure applied on column: 14Mpa;
Injection volume: 2 nl;
Detector wavelength: UV 254 nm;
Peaks: 1. dimethyl phthate; 2.diethyl phthate; 3. naphthalene